54216621 has 20 divisors (see below), whose sum is σ = 85756572. Its totient is φ = 34017408.

The previous prime is 54216611. The next prime is 54216623. The reversal of 54216621 is 12661245.

It can be written as a sum of positive squares in 2 ways, for example, as 49154121 + 5062500 = 7011^2 + 2250^2 .

It is not a de Polignac number, because 54216621 - 2⁷ = 54216493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54216623) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18310 + ... + 21063.

Almost surely, 2^54216621 is an apocalyptic number.

54216621 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

54216621 is a deficient number, since it is larger than the sum of its proper divisors (31539951).

54216621 is a wasteful number, since it uses less digits than its factorization.

54216621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39402 (or 39393 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 54216621 is about 7363.1936685110. The cubic root of 54216621 is about 378.4810579726.

Adding to 54216621 its reverse (12661245), we get a palindrome (66877866).

The spelling of 54216621 in words is "fifty-four million, two hundred sixteen thousand, six hundred twenty-one".